release/src-rt-6.x/linux/linux-2.6/drivers/s390/scsi/zfcp_sysfs_port.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "zfcp_ext.h"
  23
  24 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  25
  26 /**
  27  * zfcp_sysfs_port_release - gets called when a struct device port is released
  28  * @dev: pointer to belonging device
  29  */
  30 void
  31 zfcp_sysfs_port_release(struct device *dev)
  32 {
  33         kfree(dev);
  34 }
  35
  36 /**
  37  * ZFCP_DEFINE_PORT_ATTR
  38  * @_name:   name of show attribute
  39  * @_format: format string
  40  * @_value:  value to print
  41  *
  42  * Generates attributes for a port.
  43  */
  44 #define ZFCP_DEFINE_PORT_ATTR(_name, _format, _value)                    \
  45 static ssize_t zfcp_sysfs_port_##_name##_show(struct device *dev, struct device_attribute *attr,        \
  46                                               char *buf)                 \
  47 {                                                                        \
  48         struct zfcp_port *port;                                          \
  49                                                                          \
  50         port = dev_get_drvdata(dev);                                     \
  51         return sprintf(buf, _format, _value);                            \
  52 }                                                                        \
  53                                                                          \
  54 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_port_##_name##_show, NULL);
  55
  56 ZFCP_DEFINE_PORT_ATTR(status, "0x%08x\n", atomic_read(&port->status));
  57 ZFCP_DEFINE_PORT_ATTR(in_recovery, "%d\n", atomic_test_mask
  58                       (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status));
  59 ZFCP_DEFINE_PORT_ATTR(access_denied, "%d\n", atomic_test_mask
  60                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status));
  61
  62 /**
  63  * zfcp_sysfs_unit_add_store - add a unit to sysfs tree
  64  * @dev: pointer to belonging device
  65  * @buf: pointer to input buffer
  66  * @count: number of bytes in buffer
  67  *
  68  * Store function of the "unit_add" attribute of a port.
  69  */
  70 static ssize_t
  71 zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
  72 {
  73         fcp_lun_t fcp_lun;
  74         char *endp;
  75         struct zfcp_port *port;
  76         struct zfcp_unit *unit;
  77         int retval = -EINVAL;
  78
  79         down(&zfcp_data.config_sema);
  80
  81         port = dev_get_drvdata(dev);
  82         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
  83                 retval = -EBUSY;
  84                 goto out;
  85         }
  86
  87         fcp_lun = simple_strtoull(buf, &endp, 0);
  88         if ((endp + 1) < (buf + count))
  89                 goto out;
  90
  91         unit = zfcp_unit_enqueue(port, fcp_lun);
  92         if (!unit)
  93                 goto out;
  94
  95         retval = 0;
  96
  97         zfcp_erp_unit_reopen(unit, 0);
  98         zfcp_erp_wait(unit->port->adapter);
  99         zfcp_unit_put(unit);
 100  out:
 101         up(&zfcp_data.config_sema);
 102         return retval ? retval : (ssize_t) count;
 103 }
 104
 105 static DEVICE_ATTR(unit_add, S_IWUSR, NULL, zfcp_sysfs_unit_add_store);
 106
 107 /**
 108  * zfcp_sysfs_unit_remove_store - remove a unit from sysfs tree
 109  * @dev: pointer to belonging device
 110  * @buf: pointer to input buffer
 111  * @count: number of bytes in buffer
 112  */
 113 static ssize_t
 114 zfcp_sysfs_unit_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 115 {
 116         struct zfcp_port *port;
 117         struct zfcp_unit *unit;
 118         fcp_lun_t fcp_lun;
 119         char *endp;
 120         int retval = 0;
 121
 122         down(&zfcp_data.config_sema);
 123
 124         port = dev_get_drvdata(dev);
 125         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 126                 retval = -EBUSY;
 127                 goto out;
 128         }
 129
 130         fcp_lun = simple_strtoull(buf, &endp, 0);
 131         if ((endp + 1) < (buf + count)) {
 132                 retval = -EINVAL;
 133                 goto out;
 134         }
 135
 136         write_lock_irq(&zfcp_data.config_lock);
 137         unit = zfcp_get_unit_by_lun(port, fcp_lun);
 138         if (unit && (atomic_read(&unit->refcount) == 0)) {
 139                 zfcp_unit_get(unit);
 140                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 141                 list_move(&unit->list, &port->unit_remove_lh);
 142         }
 143         else {
 144                 unit = NULL;
 145         }
 146         write_unlock_irq(&zfcp_data.config_lock);
 147
 148         if (!unit) {
 149                 retval = -ENXIO;
 150                 goto out;
 151         }
 152
 153         zfcp_erp_unit_shutdown(unit, 0);
 154         zfcp_erp_wait(unit->port->adapter);
 155         zfcp_unit_put(unit);
 156         zfcp_unit_dequeue(unit);
 157  out:
 158         up(&zfcp_data.config_sema);
 159         return retval ? retval : (ssize_t) count;
 160 }
 161
 162 static DEVICE_ATTR(unit_remove, S_IWUSR, NULL, zfcp_sysfs_unit_remove_store);
 163
 164 /**
 165  * zfcp_sysfs_port_failed_store - failed state of port
 166  * @dev: pointer to belonging device
 167  * @buf: pointer to input buffer
 168  * @count: number of bytes in buffer
 169  *
 170  * Store function of the "failed" attribute of a port.
 171  * If a "0" gets written to "failed", error recovery will be
 172  * started for the belonging port.
 173  */
 174 static ssize_t
 175 zfcp_sysfs_port_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 176 {
 177         struct zfcp_port *port;
 178         unsigned int val;
 179         char *endp;
 180         int retval = 0;
 181
 182         down(&zfcp_data.config_sema);
 183
 184         port = dev_get_drvdata(dev);
 185         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status)) {
 186                 retval = -EBUSY;
 187                 goto out;
 188         }
 189
 190         val = simple_strtoul(buf, &endp, 0);
 191         if (((endp + 1) < (buf + count)) || (val != 0)) {
 192                 retval = -EINVAL;
 193                 goto out;
 194         }
 195
 196         zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
 197         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 198         zfcp_erp_wait(port->adapter);
 199  out:
 200         up(&zfcp_data.config_sema);
 201         return retval ? retval : (ssize_t) count;
 202 }
 203
 204 /**
 205  * zfcp_sysfs_port_failed_show - failed state of port
 206  * @dev: pointer to belonging device
 207  * @buf: pointer to input buffer
 208  *
 209  * Show function of "failed" attribute of port. Will be
 210  * "0" if port is working, otherwise "1".
 211  */
 212 static ssize_t
 213 zfcp_sysfs_port_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
 214 {
 215         struct zfcp_port *port;
 216
 217         port = dev_get_drvdata(dev);
 218         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status))
 219                 return sprintf(buf, "1\n");
 220         else
 221                 return sprintf(buf, "0\n");
 222 }
 223
 224 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_port_failed_show,
 225                    zfcp_sysfs_port_failed_store);
 226
 227 /**
 228  * zfcp_port_common_attrs
 229  * sysfs attributes that are common for all kind of fc ports.
 230  */
 231 static struct attribute *zfcp_port_common_attrs[] = {
 232         &dev_attr_failed.attr,
 233         &dev_attr_in_recovery.attr,
 234         &dev_attr_status.attr,
 235         &dev_attr_access_denied.attr,
 236         NULL
 237 };
 238
 239 static struct attribute_group zfcp_port_common_attr_group = {
 240         .attrs = zfcp_port_common_attrs,
 241 };
 242
 243 /**
 244  * zfcp_port_no_ns_attrs
 245  * sysfs attributes not to be used for nameserver ports.
 246  */
 247 static struct attribute *zfcp_port_no_ns_attrs[] = {
 248         &dev_attr_unit_add.attr,
 249         &dev_attr_unit_remove.attr,
 250         NULL
 251 };
 252
 253 static struct attribute_group zfcp_port_no_ns_attr_group = {
 254         .attrs = zfcp_port_no_ns_attrs,
 255 };
 256
 257 /**
 258  * zfcp_sysfs_port_create_files - create sysfs port files
 259  * @dev: pointer to belonging device
 260  *
 261  * Create all attributes of the sysfs representation of a port.
 262  */
 263 int
 264 zfcp_sysfs_port_create_files(struct device *dev, u32 flags)
 265 {
 266         int retval;
 267
 268         retval = sysfs_create_group(&dev->kobj, &zfcp_port_common_attr_group);
 269
 270         if ((flags & ZFCP_STATUS_PORT_WKA) || retval)
 271                 return retval;
 272
 273         retval = sysfs_create_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 274         if (retval)
 275                 sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 276
 277         return retval;
 278 }
 279
 280 /**
 281  * zfcp_sysfs_port_remove_files - remove sysfs port files
 282  * @dev: pointer to belonging device
 283  *
 284  * Remove all attributes of the sysfs representation of a port.
 285  */
 286 void
 287 zfcp_sysfs_port_remove_files(struct device *dev, u32 flags)
 288 {
 289         sysfs_remove_group(&dev->kobj, &zfcp_port_common_attr_group);
 290         if (!(flags & ZFCP_STATUS_PORT_WKA))
 291                 sysfs_remove_group(&dev->kobj, &zfcp_port_no_ns_attr_group);
 292 }
 293
 294 #undef ZFCP_LOG_AREA